Motion picture projection booth and lamp house ventilator



Jan. 28, 1958 G. P. HELLER ,8

MOTION PICTURE PRQJECTION BOOTH AND LAMP HOUSE VENTILATOR Filed March 28, 1955 .fll 8 m IS /2 ag j l9 l7 I6 22 t INVEAITOR.

Y Garge R heI/er. B 1

ATTORNEYS United States Patent" C) MOTION PICTURE PROJECTION BOOTHAND'? HQUSE 'VENTILATOR George'R'Heller; Kansas ,(Eity; Mor, .assignorsto: DibMp; Incorporated; Kansas =C-ity-,-.Mo., az-corpprationrof. Mrs.- soun Application Marclr28; 1955;SeriaPNo: .497j'114 1 Claim on 98-43) This invention. relates. tor structures:- for: ventilating motion picture projection booths andi'lamp housings-rot projection..machines in such-booths: andimorerparticm larly; to a blower arrangement. for:simultaneouslysefiecfi ing, such ventilation;

Motion picture projecting :machines :aremsuallyi'located in booths andwthe :beameof light 'dirIectedlfromtheima chines through: openings: in booth' walls to" screens remotely of the booths. Suchprojections-machines :usu.-- ally utilize carbon-wlampsxto:providethe: brightb'eam of light and the burning of carbon creates high temperatures and gives'ofi carbon-or-soot. Excessive temperatures in the lamp housing causes uneven burning of the carbon and high'consumption thereof as well as creating a fire'hazard and.making...theabooth uncomfortable for operators due tofthe heat therein;

'Ihe:objects of the. present inventi'on are toprovide aaprojection booth and lamp housing:ventilatonihcluding a blower and duct arranged? whereby the blower removes air from the booth and.discharges sameinwthe duct and induces the flow ofair from'rthe lamp :houses; to provide such a ventilating apparatus: wherein. a:single blower effects removal of air simultaneously from the booth and lamp housing; to provide'such a ventilating apparatus wherein carbon .and .soot-xfromithe lamp housing is exhausted and discharged exteriorly from the booth in such a manner that it does not come into contact with the operating parts of the blower; to provide such a ventilating apparatus that permits higher amperage operation of the projection light by producing cooler lamps, reduces carbon deposits and accumulation of soot, reduces carbon consumption and more even burning of the carbon, and, by reduction in temperature, extends the life of the reflector and provides a brighter image from the projection machine and also effects a more comfortable, safer condition in the booth; and to provide a ventilating apparatus for projection booths and lamp housings therein that is economical to manufacture and efiicient in operation and improves the operation of projection equipment in projection booths.

In accomplishing these and other objects of the present invention 1 have provided improved details of structure, the preferred forms of which are illustrated in the accompanying drawings wherein:

Fig. 1 is a vertical sectional view through a portion of a projection booth with a projection machine therein and ventilating apparatus for the booth and lamp housing in accordance with my invention.

Fig. 2 is an elevational view of the blower and a por tion of the duct, said duct being broken away to illustrate the nozzle discharge of the blower in the duct.

Fig. 3 is a vertical sectional view through the duct having the blower thereon.

Fig. 4 is a vertical sectional view through a modified form of duct with a blower connected thereto for exhausting air from a plurality of projection machines.

Fig. 5 is a horizontal view through the elevating apparatus illustrated in Fig. 4.

Heferringmroredn detail to the drawingsr 1 designates a motion picture projection booth' having a floor 2; roof 3 and -wall'sa t defining a chamber 5" in which one? or mot-e motion picture projection machines 6"arelocated."

Tlie projection machine illustrated is of'fa conventional type having a lamp housing 'T'andleus assembly 8 arranged' whereby when film is moved between the lamp housing 'and'2 lens; the pictureis projected through an opening SN in: one =of-ith'e:watls=to a remote screen 1 not shown.

'Ilielamp housinglfT lias openings or louversfl" in the lower portion'thereofiand a staek' 10 extendi-ng'upwardly from' the upp'er portion whereby the heat normally created by the l'amp causes air to"movwupwardly through the lamp housing.

Iir thestructure illustratedin Figs: 1, 2 and' 3-inclusivegr a ventilating apparatus' 11 is -arranged for moving air from:- the booth; and a single projection machine. The ventilating apparatus inclr'rds a duct 12"h'aving '--:one end cornzlected to 1 and in-'- communication- Withthelamp housing-through the staek 10 an'd the other end extending outward-ly through awall 4 of the boothfor discharge exteriorly-thereofi to -th'e atmosphere: The end of the duct 12 exteriorly of the-"booth is preferably provided with a louvered cover 13 permitting air to'-flowthere= through but 'preventing rain and the like from entering the duct from exteriorly 'of the =booth The duct- 12 h'aszea branch' 14 extending therefrom at an acute angle and terminating in an open end' l5 h'aving; a flange- 16 thereon; In the illustrated structure, the branch 14 is adjaeentithe walli4- throughwhih the duct l2 extends and :said branch extends'idownwardly and inwardly L of ithe booth fr'orn said wallfi The -blower 17 preferably of thb-squirrel cage type; is connected to the branch 14. The b1ower*17'*includes a. Housing 18 having an inlet"- opening 19 'on one side thereof? and a motor 2'0 mounted on the opposite =side andiop'eratively conneetedfitda rotcir' or impeller" 21 in the housing which when operated draws air through the opening 19 and discharges same through an outlet connection 22 which is preferably provided with a flange 23, suitably secured to the flange 16 of the branch 14. A nozzle 24 is secured in the outlet connection 22 and extends through the branch 14 terminating as at 25, substantially centrally of the duct 12 whereby the discharge of the blower 17 is directed into the duct 12 generally in the direction of flow of air through the duct whereby the discharge from the nozzle 24 induces flow of air through the duct from the lamp housing to the exterior of the booth.

In operating a ventilating apparatus constructed as described, the motor is energized by a suitable electric circuit rotating the impeller 21 whereby air is drawn from the interior of the booth I through the opening 19 and discharged through the nozzle 24 into the duct 12 for flow to the exterior of the booth thereby removing air from the interior of the booth, the air being replaced through suitable openings such as the opening 9 and any other suitable ventilating openings in the walls of the booth. This operation of the blower removes heat, dust and the like from the chamber 5 of the projection booth.

The discharge of the air from the nozzle 24 induces a flow of air through the duct 12 drawing air through the louvers or openings in the lamp housing 7, through said housing and stack 10 to provide a forced air flow through the lamp housing and discharge of said air exteriorly of the booth. Carbon deposits, soot and the like, resulting from the burning of the carbon in the lamp housing, is drawn through the duct and discharged exteriorly of the booth without coming into contact with the parts of the blower 17. This induced air flow through the lamp housing reduces the internal temperature of the projector in that a substantial amount of the heat produced is removed thereby providing for cooler operation of the lamps which permits higher amperage operation. The air flow also materially reduces accumulation of soot and carbon deposits, extends the life of the reflector in the lamp housing, provides a better or brighter image and also provides a more even buming of the carbon and reduces carbon consumption.

In the form of the invention illustrated in Figs. 4 and 5, ducts 12 are suitably connected to stacks of a plurality of motion picture projection machines and the discharge ends of said ducts 12 are connected to and in communication with a T-fitting 26. The ducts 12 are preferably connected to aligned branches of the T-fitting which has a branch 27 at right angles thereto, the branch 27 being connected to a duct 12' leading to the exterior of the booth.

The T-fitting 26 has a flanged connection 28 with a passage 29 therethrough axially aligned with the branch 27. The blower 17 has its discharge connection 22 suitably secured to the connection 28. The discharge connection 22 has a nozzle 30 that extends through the passage 29 and terminates as at 31 in the duct 12' whereby operation of the blower 17 delivers a jet of air through the nozzle 30 into the duct 12 inducing a flow of air therethrough that draws air from the lamp housing through the ducts 12. With this arrangement the blower 17 exhausts air from the interior of the booth and discharges said air in a jet which induces an exhaust of air from the lamp housings of the projection machines.

It is believed obvious that I have provided a projection booth and lamp housing ventilator that provides more eflicient operation of the projection machine, reduces the temperature in the lamp housing and booth and provides for more eflicient operation and safer .working conditions.

What I claim and desire to secure by Letters Patent is:

In a motion picture projecting apparatus, walls defining a motion picture projecting booth having a chamber therein and an opening in one wall thereof, a motion picture projector in the chamber directed toward the opening for projecting pictures therethrough, said projector having a louvered lamp housing with a stack extending from and communicating with the interior of the lamp housing, a duct having an inlet connected with the stack and an outlet exteriorly of the walls that define said projecting booth for communicating the stack with the atmosphere exteriorly thereof, a branch on the duct adjacent the wall through which the duct extends and said branch extendingrearwardly at an acute angle into the interior of the chamber, a blower in the chamber and having an inlet opening communicating with the interior of the chamber for removing air therefrom, a discharge outlet connection extending from the blower, flange means securing .the discharge outlet connection to the duct branch, and a nozzle communicating with the discharge outlet connection of the blower and extending through the duct branch and terminating in a jet opening substantially centrally of the duct and directed toward the outlet of the duct whereby operation of the blower draws air from the chamber and discharges same in a jet directed into the duct toward the outlet of the duct for inducing flow of air therein drawing air from the chamber through the louvers of the lamp housing then from said housing through the stack and duct for discharge exteriorly of the projection booth.

References Cited in the file of this patent UNITED STATES PATENTS 387,178 Murphy July 31, 1888 1,527,849 Elliott Feb. 24, 1925 1,767,869 Baumgarten June 24, 1930 1,937,379 Berg Nov. 28, 1933 1,937,970 Ludwig Dec. 5, 1933 2,014,187 Netf Sept. 10, 1935 2,029,871 Johnson Feb. 4, 1936 2,566,033 Reeves Aug. 28, 1951 FOREIGN PATENTS 20,853 Denmark Dec. 27, 1915 

